Each session will last approximately 15 minutes, with five physiotherapy sessions taking place over a period of 3 months. The Self-Myofascial release protocol for the lower limbs using a Foam Roller and and Solid Ball Massage, adapted to patients with hemophilic ankle arthropathy will include 11 exercises that must be administered bilaterally. A mobile application will be developed where each patient will be able to observe the exercises to be carried out.

Patients included in the control group will not receive any physiotherapy intervention. They will continue with their routine prior to the beginning of the study.

The Self-Myofascial release protocol for the lower limbs using a Foam Roller will include: Self-Myofascial release of the plantar region using and Solid Ball Massage; release of the myofascial components of the back of the leg using a Foam Roller; release of the myofascial components of the anterior part of the leg using a Foam Roller; release of myofascial components of the hamstring region using a Foam Roller; release of the myofascial components of the adductor muscles using a Solid Ball Massage in a sitting position; release of the myofascial components of the abductor muscles using a Foam Roller in lateral decubitus; and release of the myofascial components of the pelvitrochanteric muscles using a Foam Roller in a sitting position.

Visual analogic scale (VAS). This scale will be used to evaluate the perception of joint pain, where ankle joint pain ranges from 0 to 10 points (no pain to maximum perceived pain).

Pressure algometer. Measuring instrument used to evaluate pressure joint pain. The instrument shall consist of a measuring device attached to a hard rubber tip 1.1 cm in diameter. Its sphere shall be calibrated in kg/cm2 with divisions of 0.1 kg/cm2. The pressure algometry methodology applied was based mainly on the study by Hogeweg. Before taking the measurements, patients will be instructed to say "yes" as soon as pressure exerted by the algometer becomes slightly unpleasant. The pressure algometer shall be kept perpendicular to the surface of the skin with the right hand, stabilizing the axis of the instrument using the thumb and index finger of the left hand. The pressure shall be increased at a uniform rate of approximately 1 kg/cm2 per second. As soon as the subject, according to the instructions, says "yes", the pressure will be stopped and the score will be noted.